package com.example.multitenancy01.util;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;


/**
 * spring 容器
 */
@Component
@Slf4j
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
       log.info("配置applicationContext");
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }



    /**
     * 大写转小写并在前边加上_  公共方法
     * @param name
     * @return
     */
    public static String bigLetterToSmall(String name) {
        StringBuffer stringBuffer = new StringBuffer();
        char[] chars = name.toCharArray();
        for (char ch : chars) {
            boolean digit = Character.isUpperCase(ch);
            if (digit) {
                String str = String.valueOf(ch);
                String lstr = str.toLowerCase();
                stringBuffer.append("_");
                stringBuffer.append(lstr);
            } else {
                stringBuffer.append(ch);
            }
        }
        return stringBuffer.toString();
}

}